JP2017025831A - Water-conveyance duct for water wheel - Google Patents

Water-conveyance duct for water wheel Download PDF

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JP2017025831A
JP2017025831A JP2015146456A JP2015146456A JP2017025831A JP 2017025831 A JP2017025831 A JP 2017025831A JP 2015146456 A JP2015146456 A JP 2015146456A JP 2015146456 A JP2015146456 A JP 2015146456A JP 2017025831 A JP2017025831 A JP 2017025831A
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water
duct
water guide
turbine according
guide duct
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JP6721953B2 (en
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鈴木　政彦
Masahiko Suzuki
政彦 鈴木
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Bellsion KK
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Bellsion KK
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Priority to JP2015146456A priority Critical patent/JP6721953B2/en
Priority to CN201680015612.5A priority patent/CN107407252B/en
Priority to PCT/JP2016/057060 priority patent/WO2016147938A1/en
Priority to KR1020177026697A priority patent/KR20170128353A/en
Priority to TW105107551A priority patent/TW201641813A/en
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/20—Hydro energy

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Abstract

PROBLEM TO BE SOLVED: To provide a water-conveyance duct for a water wheel which is arranged in an irrigation channel and can obtain an efficient power generation effect.SOLUTION: A bottom face 4B of a water channel 4 penetrating longitudinally is formed into a circular arc curved face in which a longitudinal central portion protrudes upward in a circular arc curved shape in a central longitudinal surface and the bottom face is gradually lowered from a highest part 4C toward the rear end.SELECTED DRAWING: Figure 1

Description

本発明は、水路の水流を効率良く利用することのできる、水車の導水ダクトに関する。   The present invention relates to a water guide duct of a water turbine that can efficiently use a water flow in a water channel.

ダクト内に水車を配設する技術は、例えば特許文献１に開示されている。   A technique for disposing a water wheel in a duct is disclosed in Patent Document 1, for example.

特開２０００−９０１２号公報Japanese Patent Laid-Open No. 2000-9012

前記、特許文献１に記載の発電装置は、管径が一定な長いダクト内に、多数の発電機が配設されている。
このようなダクトを、例えば水路に設置すると、発電機が抵抗となって、ダクト内を通過する流水は、その外側の流水よりも低速の流水となり、発電効率は低下する。
本発明は、ダクトで用水路を塞ぐように配設し、高くなる水圧を利用することのできる水車の導水ダクト（以下単にダクトという）を提供することを目的としている。 In the power generation device described in Patent Document 1, a large number of generators are arranged in a long duct having a constant tube diameter.
When such a duct is installed in a water channel, for example, the generator becomes a resistance, and the flowing water passing through the duct becomes a slower flowing water than the outer flowing water, and the power generation efficiency decreases.
An object of the present invention is to provide a water guide duct (hereinafter simply referred to as a duct) of a water turbine that is disposed so as to block a water channel with a duct and that can utilize a rising water pressure.

本発明の具体的な内容は、次の通りである。   The specific contents of the present invention are as follows.

（１）前後に貫通する導水路の底面を、中央縦断側面において、前縁を球面状とし、最高部から後端へかけて次第に下降する弧曲面とされているる水車の導水ダクト。 (1) A water guide duct for a water turbine in which a bottom surface of a water guide passage penetrating in the front-rear direction has a spherical shape with a front edge at a central longitudinal side surface and gradually descends from a highest part to a rear end.

（２） 前記導水路の上内壁面を、前後の中央部分が下がる弧曲面としてある前記（1）に記載の水車の導水ダクト。 (2) The water guide duct of the water turbine according to (1), wherein the upper inner wall surface of the water guide channel is an arc curved surface in which front and rear central portions are lowered.

（３） 側面視で、前面が上面から下前部へ斜めに形成されている前記（1）または（2）に記載の水車の導水ダクト。 (3) The water guide duct of the water turbine according to (1) or (2), wherein the front surface is formed obliquely from the upper surface to the lower front portion in a side view.

（４）導水路の前口は、正面視で四角形である前記（1）〜（3）のいずれかに記載の水車の導水ダクト。 (4) The water guide duct of the water turbine according to any one of (1) to (3), wherein the front entrance of the water guide channel is a quadrangle in a front view.

（５）前記通水路における底面の最高部に水車を配設する前記（1）〜（4）のいずれかに記載の水車の導水ダクト。 (5) The water guide duct for a water turbine according to any one of (1) to (4), wherein a water turbine is disposed at the highest portion of the bottom surface of the water passage.

（６）平面視で、側面に止水材が装着される前記（1）〜（5）のいずれかに記載の水車の導水ダクト。 (6) The water guide duct for a water turbine according to any one of (1) to (5), wherein a water-stopping material is attached to a side surface in a plan view.

（７）素材は発泡樹脂の芯体にＦＲＰの表層を形成した前記（1）〜（6）のいずれかに記載の水車の導水ダクト。 (7) A water guide duct for a water turbine according to any one of (1) to (6), wherein the material is a foamed resin core formed with an FRP surface layer.

（８）上部には、ダクトを水底に固定するための固定手段が配設されている前記（1）〜（7）のいずれかに記載の水車の導水ダクト。 (8) The water guide duct for a water turbine according to any one of (1) to (7), wherein fixing means for fixing the duct to the bottom of the water is disposed at an upper portion.

本発明によると、次のような効果が奏せられる。   According to the present invention, the following effects can be obtained.

前記（1）に記載の発明は、前後に貫通する導水路の底面が、縦断側面視で、前縁が球面状で、最高部から後端へかけて次第に降下する弧曲面とされているので、この導水路に入った水流は、底層流が前縁を摺り上がり、最高部から速度を上げながら、後部の緩やかな勾配の弧曲面坂を高速で下る。
導水路の底面の最高部分は隘路にあたるので、ここに水車を配設すると、効率のよい高速回転をし、発電をさせることができる。 In the invention described in (1), the bottom surface of the water guide channel penetrating in the front-rear direction is a longitudinal side view, the front edge is spherical, and the arc surface gradually descends from the highest part to the rear end. The water flow that has entered this waterway is descending at a high speed on the arcuate slope with a gentle slope at the rear, while the bottom layer flows up the leading edge and increases its speed from the highest part.
Since the highest part of the bottom surface of the water guide channel is a bottleneck, if a water wheel is provided here, efficient high-speed rotation can be performed and electric power can be generated.

前記（2）に記載の発明は、導水路の上内壁面が、前後の中央部分で下に突出する弧曲面としてあるので、コアンダ効果によって中央部分に高速流が生じるため、底面の最高部とで隘路効果を増大させる。   In the invention described in (2), since the upper inner wall surface of the water conduit is an arc curved surface protruding downward at the front and rear central portions, a high-speed flow is generated in the central portion due to the Coanda effect. Increase the Kushiro effect.

前記（3）に記載の発明は、側面視で、上部よりも下部が前方へ突出しているので、導水路の底面を前方へ突出させ、水圧のかかっている用水路の底層流を、導水路の前端面に導き易い。   In the invention described in (3), the bottom portion of the water conduit projects forward from the top in the side view, so that the bottom surface of the water conduit is projected forward, Easy to guide to the front end face.

前記（4）に記載の発明は、前口が正面視で四角形なので、水路幅に合わせて配設されていると、水路の幅いっぱいの流水を、導水路内の水車へ誘導することができる。   In the invention described in (4) above, since the front opening is a quadrangle in front view, when it is arranged in accordance with the width of the water channel, it is possible to guide water flowing across the width of the water channel to the water wheel in the water channel. .

前記（5）に記載の発明は、導水路の底面の最高部分に水車を配設するので、その部分は隘路であり、高速流が通過するため、効率の良い発電をさせることができる。   In the invention described in (5) above, since the water wheel is disposed at the highest part of the bottom surface of the water conduit, the part is a bottleneck and high-speed flow passes, so that efficient power generation can be performed.

前記（6）に記載の発明は、平面視で、側面に止水材が装着されているで、水路の側壁面とダクトの外側面との間に間隙があっても、止水材によってダクトの外側面と、水路の側壁面との間の隙間を塞いで、ダクト内に水流が高い水圧で入り易くすることができる。   In the invention described in (6), the water-stopping material is attached to the side surface in a plan view, and even if there is a gap between the side wall surface of the water channel and the outer surface of the duct, It is possible to close the gap between the outer surface of the water channel and the side wall surface of the water channel so that the water flow can easily enter the duct with high water pressure.

前記（7）に記載の発明は、ＦＲＰで形成するので、水路の堰のようなダクトも容易に製造することができ、軽量なので運搬や設置作業性に優れている。   Since the invention described in (7) is formed of FRP, a duct such as a weir of a water channel can be easily manufactured, and since it is lightweight, it is excellent in transportation and installation workability.

前記（8）に記載の発明は、上部にダクトを水底に固定するための固定手段が配設されているので、ダクトが移動しないように水底に固定することができる。増水した時は、ダクトの上面を乗り越えて流れる。   In the invention described in (8), since the fixing means for fixing the duct to the bottom of the water is disposed at the top, it can be fixed to the bottom of the water so that the duct does not move. When the water rises, it flows over the upper surface of the duct.

本発明水車の導水ダクトの縦断側面図である。It is a vertical side view of the water guide duct of the water turbine of the present invention. 本発明水車の導水ダクトの正面である。It is the front of the water guide duct of this invention water turbine. 本発明水車の導水ダクトの平面図である。It is a top view of the water guide duct of the water turbine of the present invention.

以下本発明を、図面を参照して説明する。
図１において、水車の導水ダクト１（以下単にダクトという）は、側面視でほぼ台形に形成されている。 The present invention will be described below with reference to the drawings.
In FIG. 1, a water guide duct 1 (hereinafter simply referred to as a duct) of a water turbine is formed in a substantially trapezoidal shape in a side view.

ダクト１の前面２から後面３へかけて貫通する導水路４が形成され、その上内壁面４Ａは上方に位置して、前後の中央部分が下に突出する弧曲面に形成されている。また底面４Ｂの前後端部は、水路底面ｒに接するほど下位にあり、縦断側面図における前縁は、球面状とし、最高部４Ｃから後端へかけて下り坂の弧曲面とされている。   A water conduit 4 is formed to penetrate from the front surface 2 to the rear surface 3 of the duct 1, and its upper inner wall surface 4 </ b> A is positioned upward, and is formed into an arc curved surface with front and rear central portions protruding downward. Further, the front and rear end portions of the bottom surface 4B are lower as they come into contact with the water channel bottom surface r, and the front edge in the longitudinal side view has a spherical shape, and is an arc curved surface of a downhill from the highest portion 4C to the rear end.

前面２は、上部から下面へかけて前方へ斜めに突出している。これによって導水路４の底面４Ｂの前下部４Ｄを前に突出させて、水路底面ｒから底層流を内部の最高部４Ｃへ、効率良く案内することができる。   The front surface 2 projects obliquely forward from the top to the bottom. As a result, the front lower portion 4D of the bottom surface 4B of the water conduit 4 can be projected forward, and the bottom layer flow can be efficiently guided from the water channel bottom surface r to the internal highest portion 4C.

導水路４の底面４Ｂは、揚力型翼の断面よりも膨出が大なので、この底面４Ｂに沿って通過する水流は、コアンダ効果によって高速となって通過する。また最高部４Ｃにおいては隘路となっているので、この部分の流速が１番早くなる。
従って、この最高部４Ｃに水車５のロータ６を配設すると、効率のよい発電をさせることができる。 Since the bottom surface 4B of the water conduit 4 is larger than the section of the lift-type wing, the water flow passing along the bottom surface 4B passes at a high speed due to the Coanda effect. Further, since the highest portion 4C is a bottleneck, the flow velocity in this portion is the fastest.
Therefore, if the rotor 6 of the water turbine 5 is disposed at the highest portion 4C, efficient power generation can be performed.

水車５は、水車筐体５Ａ内部に支持されたロータ軸６Ａの先端に、ロータ６が装着されており、ロータ６の揚力型ブレード７は、先端を前方へ傾斜された傾斜部７Ａとされている。   In the water turbine 5, the rotor 6 is attached to the tip of the rotor shaft 6A supported inside the water turbine casing 5A, and the lift-type blade 7 of the rotor 6 is formed as an inclined portion 7A whose tip is inclined forward. Yes.

水車筐体５Ａは、ダクト１を貫通して上に突出した吊体８に支持され、吊体８の上端は、吊桁９に固定された発電機10に連結されている。吊体８の内部には、ロータ軸６Ａと連結された図示しない伝動軸が内装されて、伝動軸は発電機10の主軸に連結されて、ロータ６の回転により発電機10が発電する。   The water turbine casing 5 </ b> A is supported by a suspended body 8 that protrudes upward through the duct 1, and the upper end of the suspended body 8 is connected to a generator 10 fixed to a suspended girder 9. Inside the suspended body 8, a transmission shaft (not shown) connected to the rotor shaft 6 </ b> A is housed, the transmission shaft is connected to the main shaft of the generator 10, and the generator 10 generates power by the rotation of the rotor 6.

ダクト１が流されて移動しないように、用水路Ｒの両岸に架設した支持桁11から、固定手段12がダクト１の上面を抑えている。固定手段12は、公知のどのようなものでもかまわないが、図１においては、手回しのネジ棒が示してある。
ダクト１の底面４Ｂの内部には、必要に応じて、着脱可能に重錘13を装着する。 Fixing means 12 suppresses the upper surface of the duct 1 from support girders 11 erected on both sides of the irrigation channel R so that the duct 1 is not moved and moved. The fixing means 12 may be any known one, but in FIG. 1, a screwdriver screw is shown.
A weight 13 is detachably mounted inside the bottom surface 4B of the duct 1 as necessary.

図３に示すように、必要に応じて、ダクト１の両側部に、斜め前外側から後内方へ深く、かつ上から下へ貫通する切込み14、14を形成し、板状の止水材15、15を嵌装する。止水材15は、用水路Ｒの側壁とダクト１の外側との間隙に合わせて、適宜長さを合わせる。   As shown in FIG. 3, if necessary, notches 14 and 14 are formed on both sides of the duct 1 so as to penetrate deeply from the front outer side to the rear inner side and penetrate from the top to the bottom. 15 and 15 are fitted. The water blocking material 15 is appropriately adjusted in length according to the gap between the side wall of the water channel R and the outside of the duct 1.

これによってダクト１は用水路Ｒの堰のような役割を果たし、堰止められた流水は、ダクト１の上面を越えて流下し、水圧のかかった流水がダクト１の導水路４に入り、高速で通過し、水車５を効率良く回転させる。   As a result, the duct 1 plays a role like a weir in the irrigation channel R, and the dammed running water flows down over the upper surface of the duct 1, and the flowing water enters the water conduit 4 of the duct 1 at high speed. Pass through and rotate the water turbine 5 efficiently.

ダクト１の前面２には、必要に応じて、図１に示す塵除16を取着ける。塵除16は縦縞格子状、簀の子状その他、適宜の物を、下端を前方に斜めにすることにより、これに当接した塵埃は上方へ上がり、ダクト１の上面を通過する。   A dust remover 16 shown in FIG. 1 can be attached to the front surface 2 of the duct 1 as necessary. The dust remover 16 has a vertically striped lattice shape, a trapezoidal shape, and other appropriate objects. By tilting the lower end forward, the dust that comes in contact with the dust rises upward and passes through the upper surface of the duct 1.

ダクト１の材質は任意であるが、例えば、芯部を発泡樹脂で形成し、表面をＦＲＰの表層とする。これにより、ある程度大きなダクトでも容易に成形することができ、また軽量なので搬送や設置が容易である。当然に、ＦＲＰの中空体とし、中空部に水を満たすことによって水路Ｒに沈設する。   Although the material of the duct 1 is arbitrary, for example, the core is formed of foamed resin and the surface is the surface layer of FRP. This makes it possible to easily form a duct that is somewhat large, and because it is lightweight, it can be easily transported and installed. Naturally, it is set as the hollow body of FRP, and it sinks in the water channel R by filling a hollow part with water.

製造方法として、図１に示すダクト１を上下に２分割した形で成形し、上部部材に水車５を取着ける。その後、上下の部材を重ねて接合させる。
あるいは四角筒をＦＲＰか金属で形成し、その内面に、発泡樹脂で成形した内部部材を貼り付ける。 As a manufacturing method, the duct 1 shown in FIG. 1 is formed in a vertically divided form, and the water turbine 5 is attached to the upper member. Thereafter, the upper and lower members are overlapped and joined.
Or a square cylinder is formed with FRP or a metal, and the internal member shape | molded with the foaming resin is affixed on the inner surface.

設置する時は、用水路Ｒの水源を閉塞し、ダクト１を水路底面ｒに固定する。吊体８の長さを調整して、吊桁９に支持される発電機10に、内部の伝動軸を接続させる。   When installing, the water source of the irrigation channel R is closed, and the duct 1 is fixed to the channel channel bottom r. The length of the suspension body 8 is adjusted, and the internal transmission shaft is connected to the generator 10 supported by the suspension girder 9.

用水路Ｒに水が流れると、底層流はダクト１の前下部４Ｄから、導水路４の前坂４Ｅを登って最高部４Ｃに達し、上層流と合流して、コアンダ効果によって高速となって後方へ通過し、その過程で水車５のロータ６を効率良く回転させる。   When water flows in the irrigation channel R, the bottom layer flow rises from the front lower part 4D of the duct 1 up the front slope 4E of the conduit 4 to the highest part 4C, merges with the upper layer flow, and becomes high speed due to the Coanda effect and to the rear The rotor 6 of the water turbine 5 is efficiently rotated in the process.

また、導水路４の上内壁面４Ａにおいても、前後の中央部が下向きに膨出しているので、コアンダ効果によって、この中央部分で水流は高速となって通過する。
ロータ６の揚力型ブレード７に当る高速水流は、遠心方向へ移動し、傾斜部７Ａで拡散が抑止され、回転効率が高まる。 In addition, since the front and rear central portions bulge downward also on the upper inner wall surface 4A of the water conduit 4, the water flow passes through the central portion at a high speed due to the Coanda effect.
The high-speed water flow that hits the lift-type blade 7 of the rotor 6 moves in the centrifugal direction, the diffusion is suppressed by the inclined portion 7A, and the rotation efficiency is increased.

このダクト１は、水流を集めて通過させるというだけではなく、導水路４の底面４Ｂの縦断面で、中間が高くなった弧曲面としてあるため、コアンダ効果によって、ダクト１の底面４Ｂにおいて、水圧のかかっている底層流が、高速で通過する点に特長がある。   The duct 1 not only collects and passes the water flow, but also has an arc curved surface with a high middle in the longitudinal section of the bottom surface 4B of the water conduit 4, so that the water pressure is reduced at the bottom surface 4B of the duct 1 by the Coanda effect. It has a feature in that the bottom layer flow on which it is applied passes at high speed.

また、ダクト１を用水路Ｒを塞ぐように配設すると、ダクト１で水流を堰止める作用が生じ、水圧がダクト１にかかるので、導水路４内に生じるコアンダ効果は、ロータ６を効率高く回転させる。   In addition, when the duct 1 is disposed so as to block the irrigation channel R, the action of blocking the water flow occurs in the duct 1 and the water pressure is applied to the duct 1, so the Coanda effect generated in the water guide channel 4 rotates the rotor 6 with high efficiency. Let

なお、図３における止水材１５を硬質な物とし、例えば用水路Ｒの側壁に、図示しないコ字状の枠体を装着し、その溝部に止水材１５の先端部を嵌装させることによって、ダクト１の固定と堰板の役割をさせることができる。   In addition, by making the water stop material 15 in FIG. 3 into a hard thing, for example, attaching the U-shaped frame which is not shown in figure to the side wall of the water channel R, and fitting the front-end | tip part of the water stop material 15 in the groove part The duct 1 can be fixed and function as a dam plate.

この発明は、ダクト内の隘路と、コアンダ効果を合わせて導水路内の高速流を生じさせるので、流速の遅い用水路等における水力発電に利用して、高い効果が得られる。   Since the present invention generates a high-speed flow in the water conduit by combining the bottleneck in the duct and the Coanda effect, a high effect can be obtained by utilizing it for hydroelectric power generation in a waterway having a low flow velocity.

１．水車の導水ダクト
２．前面
３．後面
４．通水路
４Ａ．上内壁面
４Ｂ．底面
４Ｃ．最高部
４Ｄ．前下部
４Ｅ．前坂
５．水車
５Ａ．水車筐体
６．ロータ
６Ａ．ロータ軸
７．揚力型ブレード
７Ａ．傾斜部
８．吊体
９．吊桁
10. 発電機
11．支持桁
12．固定手段
13．重錘
14．切込み
15．止水材
16．塵除
Ｒ．用水路
ｒ．水路底面 1. 1. Water guide duct of water wheel Front surface 3. Rear surface4. Waterway 4A. Upper inner wall surface 4B. Bottom surface 4C. Highest part 4D. Front lower part 4E. Maesaka 5. Water wheel 5A. Waterwheel housing6. Rotor 6A. 6. Rotor shaft Lifting blade 7A. Inclined portion 8. 8. Suspended body 9. Hanging girders
10. Generator
11． Supporting girder
12． Fixing means
13. Weight
14. Notch
15． Water stop material
16． Dust removal Irrigation channel r. Bottom of waterway

Claims (8)

前後に貫通する導水路の底面を、中央縦断側面において、前縁を球面状とし、最高部から後端へかけて次第に下降する弧曲面とされていることを特徴とする水車の導水ダクト。   A water guide duct for a water turbine, characterized in that a bottom surface of a water guide passage penetrating in the front-rear direction has a spherical shape with a front edge at a central longitudinal side surface and gradually descending from the highest part to the rear end. 前記導水路の上内壁面を、前後の中央部分が下がる弧曲面としてあることを特徴とする請求項１に記載の水車の導水ダクト。   The water guide duct of the water turbine according to claim 1, wherein the upper inner wall surface of the water guide channel is an arc curved surface in which front and rear central portions are lowered. 側面視で前面が上面から下前部へ斜めに形成されていることを特徴とする請求項１または２に記載の水車の導水ダクト。   The water guide duct for a water turbine according to claim 1 or 2, wherein the front surface is formed obliquely from the upper surface to the lower front part in a side view. 導水路の前口は、正面視で四角形であることを特徴とする請求項１〜３のいずれかに記載の水車の導水ダクト。   The water guide duct for a water turbine according to any one of claims 1 to 3, wherein the front entrance of the water guide channel is rectangular in front view. 前記通水路における底面の最高部に、水車を配設することを特徴とする請求項１〜４のいずれかに記載の水車の導水ダクト。   The water guide duct for a water turbine according to any one of claims 1 to 4, wherein a water turbine is disposed at a highest portion of a bottom surface of the water passage. 平面視で、側面に止水材が装着されることを特徴とする請求項１〜５のいずれかに記載の水車の導水ダクト。   The water guide duct for a water turbine according to any one of claims 1 to 5, wherein a water stop material is attached to a side surface in a plan view. 素材は発泡樹脂の芯体にＦＲＰの表層を形成したことを特徴とする請求項１〜６のいずれかに記載の水車の導水ダクト。   The water conduit for a water turbine according to any one of claims 1 to 6, wherein the material is formed by forming an FRP surface layer on a foamed resin core. 上部には、ダクトを水底に固定するための固定手段が配設されていることを特徴とする請求項１〜７のいずれかに記載の水車の導水ダクト。   The water guide duct for a water turbine according to any one of claims 1 to 7, wherein a fixing means for fixing the duct to the bottom of the water is disposed at an upper part.
JP2015146456A 2015-03-13 2015-07-24 Water turbine duct Expired - Fee Related JP6721953B2 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
JP2015146456A JP6721953B2 (en) 2015-07-24 2015-07-24 Water turbine duct
CN201680015612.5A CN107407252B (en) 2015-03-13 2016-03-08 Water turbine device
PCT/JP2016/057060 WO2016147938A1 (en) 2015-03-13 2016-03-08 Water wheel device
KR1020177026697A KR20170128353A (en) 2015-03-13 2016-03-08 Aberration device
TW105107551A TW201641813A (en) 2015-03-13 2016-03-11 Water wheel device

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